Indebtedness (Details) - USD ($) $ in Millions	Aug. 01, 2015	Mar. 01, 2015
Senior Notes [Member] | 5.125% Senior Notes [Member]
Unsecured Notes [Abstract]
Debt Instrument, Repurchased Face Amount		$ 300.0
Interest Rate		5.125%
Senior Notes [Member] | 3.75% Senior Notes [Member]
Unsecured Notes [Abstract]
Debt Instrument, Face Amount		$ 400.0
Interest Rate		3.75%
Mortgages [Member] | 7.0% Mortgage [Member]
Unsecured Notes [Abstract]
Debt Instrument, Repurchased Face Amount	$ 105.8
Interest Rate	7.00%